News & Perspective

Also, Croatia reports its first high-path H5N5 outbreak in poultry.

Officials said the shifts haven't changed the epidemiologic or clinical patterns in people.

So far there's no sign that H7N9 epidemiology is changing for humans, but for poultry, the virus has become more deadly.

Analyses of samples from China and Taiwan hint at resistance to antiviral drugs.

Health officials didn't confirm news reports that Zika is transmitting in Miami Beach, but said they are probing 8 areas outside the known hot spot.